Gear swapping - Third Generation F-Body Message Boards

vipershark11 · 03-26-2006, 10:35 PM

ok in my stock 1989 firebird with drum non posi rear i believe from reading i have 2.73 gears stock? is there a way to swap to a higher gear such as 3.42's and if so can someone explain how to?

eXesiv|83ta · 03-26-2006, 10:57 PM

its probably be more work than you want or are capable of. You will have to get some new parts and basically you have to remove the cover, remove the axles, unbolt the caps to the carrier, pull it out, swap ring gears, and remove and swap the pinion gear also. There are some special tools needed like an in/lb torque wrench and such.

vipershark11 · 03-26-2006, 10:59 PM

ok thanks for your help i am more than capable my dad owns a mechanic shop and i work there with him so i got everything right there for me.

Im able to get a posi rear that has the same gears as mine now but its posi so would that make a great difference when racing?

eXesiv|83ta · 03-26-2006, 11:10 PM

ya, if it works it should help you will have better traction.

maroon88iroc · 03-29-2006, 08:11 PM

lol i like your avatar...

Dialed_In · 03-29-2006, 08:29 PM

Quote:

Originally Posted by vipershark11

ok thanks for your help i am more than capable my dad owns a mechanic shop and i work there with him so i got everything right there for me.

Im able to get a posi rear that has the same gears as mine now but its posi so would that make a great difference when racing?

If you're more than capable then why are you asking how to do it?

84z28350 · 03-29-2006, 08:47 PM

Your going to find you have pulled it apart and cant do a damn thing with it!

You cant put a 3 series (3.42 up) gear on a 2 series (3.08 down) carrier without an adapter!

But If you swap in the posi and its in good working order yes it will be alot better piece, more power to the ground!

I thought you would know this if your dads a mechanic and you work there too!...

vipershark11 · 03-29-2006, 10:07 PM

well i was checking on his word and he said i couldnt and i guess he was right. i said i am capable of DOING things i just dont know how to do them all. I have done many things such as wiring cars, intake manifolds, built and put a 350 in my cousins camaro, etc etc.

eXesiv|83ta · 03-29-2006, 10:10 PM

hmmm 84 has a point I totally forgot about that difference.

my3rdgen · 03-31-2006, 03:10 PM

Quote:

Originally Posted by vipershark11

well i was checking on his word and he said i couldnt and i guess he was right.

Yes you can install a 3 series gear onto a 2 series carrier. You will need to buy a spacer. They are $45.00

http://www.speedwaymotors.com/xq/asp...qx/Product.htm

91048305 RING GEAR SPACER 7.5"GM W/BOLTS
RING GEAR SPACER/7.5"GM
EA $44.95

But if you have that 2 series posi, and are going to buy a new set of gears just get the ratio you want that fits the 2 series carrier. Richmond makes gear sets with ratios of 2.73 all the way up to 4.10 that fit on a 2 series carrier.

This gear set from Jegs is for 3.08 ratio and numerically lower carrier (2 series), and does not require the spacer. Has a 3.73 Ratio, 41-11 Teeth
Part #555-60010 $189.95